JP2805759B2 - Digital information processing device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a digital information processing apparatus.

2. Description of the Related Art A system for recording a video signal on a digital VTR, encoding a reproduced video signal and transmitting the encoded video signal has been known. The configuration is shown in FIG. The analog video signal input to the input terminal 10 is a video tape recorder (VT
R) Entered in 12. The analog video signal output from the VTR 12 is input to the coder 14, where it is coded and band-compressed. The output of the coder 14 is input via a transmission line 16 to a decoder 18 on the receiving side, where it is expanded and D / A converted. Accordingly, an analog video signal is obtained at the output terminal 20.

In the VTR 12, 22 is an A / D converter, 24 is a band compression circuit,
26 is a magnetic tape, 28 is an expansion circuit for performing expansion processing opposite to that of the band compression circuit 24, and 30 is a D / A converter. In the coder 14, reference numeral 32 denotes an A / D converter, and reference numeral 34 denotes a band compression circuit for transmission. In the decoder 18, reference numeral 36 denotes an expansion circuit for performing expansion processing corresponding to the band compression circuit 34, and reference numeral 38 denotes a D / A converter.

Also, as an application of the above signal transmission system,
A system is known in which a large number of recipients having a decoder 18 receive desired programs from a plurality of VTRs 12 (video sources) of a sender via an exchange. In this system, conventionally, on the transmitting side, a large number of transmitting devices including the VTR 12 and the coder 14 are provided, and the output of each transmitting device is connected to the exchange.

[Problems to be solved by the invention]

However, in the above conventional example, A / D conversion and compression / expansion processing are performed inside the VTR 12, and A / D conversion and compression / expansion processing are performed before and after the transmission line 16. In other words, the same processing
Because of the complicated structure, it takes a lot of time to assemble the circuit, lowers the reliability, raises the price, increases the weight, and makes it difficult to miniaturize. . When a large number of senders and a large number of recipients are connected via an exchange, the above-mentioned drawbacks become remarkable because of the aggregation of a large number of devices.

Therefore, an object of the present invention is to present a digital information processing apparatus which has solved such a drawback.

[Means for solving the problem]

A digital information processing apparatus according to the present invention includes a compression unit for compressing input digital information, a recording unit for recording compressed digital information compressed by the compression unit on a recording medium, and a compression unit recorded on the recording medium. Reproduction means for reproducing digital information; and output means for selectively outputting the compressed digital information output from the compression means and the compressed digital information reproduced by the reproduction means to an external transmission path. I do.

〔Example〕

 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention.
The analog video signal at input terminal 40 is input to coder 42, where it is A / D converted and band compressed. The output (compressed data) of the coder 42 is input to a digital data recorder (hereinafter abbreviated as DDR) 44 and recorded on a recording medium such as a magnetic tape. The reproduction data of the DDR 44 is transmitted to the transmission line 48 via the switch 46. Switch 46 to b
By connecting to the contact side, the output of the coder 42 can be transmitted to the transmission line 48 in real time. Transmission line 48
Is transmitted to the decoder 50, where the data is subjected to a process reverse to that of the coder 42, and is returned to the original bandwidth. An analog video signal is obtained at the output terminal 52.

In the coder 42, reference numeral 54 denotes an A / D converter, reference numeral 56 denotes a band compression circuit, reference numeral 58 denotes an expansion circuit for performing expansion processing reverse to that of the band compression circuit 56, and reference numeral 60 denotes a D / A converter.

FIG. 2 shows a block diagram of a configuration based on the configuration of FIG. 1 in which a large number of recipients can access a large number of video sources via an exchange. 62 is an analog signal input terminal, 64 is a coder comprising an A / D converter 66 and a band compression circuit 68, 70 is DDR, 71 is a signal line that does not use DDR, and 72 is any of a large number of DDR 70 and signal lines 71 A switch group for distributing the output of the coder 64; 74, an exchange switch having an exchange function; 76, a transmission line; 78, a decoder including an expansion circuit 80 and a D / A converter 82.

In FIG. 2, compressed data subjected to A / D conversion and band compression by the coder 64 is recorded in a desired DDR 70 by the switch 72, or is directly applied to the exchange switch 74 via the signal line 71. The receiver with the decoder 78 is
Then, the user accesses the DDR 70 in which a desired program or data is recorded through the exchange switch 74, receives the reproduced data, decompresses the data by the decompression circuit 80, and converts the data into an analog signal by the D / A converter 82. Thereby, an analog video signal can be obtained.

In the above embodiment, the case where both the input and the output are analog signals is taken as an example. Of course, both the input and the output may be handled as digital signals, in which case the coder 42,6
4 A / D converters 54 and 66 and decoders 50 and 78 D / A converters 60 and 82
Becomes unnecessary, and the configuration becomes simpler.

It goes without saying that various recording media such as a magnetic tape, a magnetic disk, an optical disk, and a magneto-optical disk can be used as the recording medium of the DDR44, 70.

〔The invention's effect〕

As can be easily understood from the above description, according to the present invention, at the time of signal transmission, the overlapping part of the processing is eliminated,
Since the configuration is simplified, circuit assembly becomes easier,
Reliability is improved. Further, the cost can be reduced, and the weight and size of the device can be reduced.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of the present invention, FIG. 2 is a block diagram showing a configuration of a system in which a large number of recipients access a large number of data sources via an exchange, and FIG. It is a block diagram. 40 …… analog input terminal, 42,64 …… coder, 44,70 ……
Digital data recorder (DDR), 48, 76 transmission line, 50, 78 decoder, 52 output terminal, 74 exchange switch

Claims (1)

(57) [Claims] 1. Compression means for compressing input digital information, recording means for recording compressed digital information compressed by the compression means on a recording medium, and reproducing compressed digital information recorded on the recording medium A digital information processing apparatus comprising: reproducing means; and output means for selectively outputting the compressed digital information output from the compressing means and the compressed digital information reproduced by the reproducing means to an external transmission path. .